RaspBee II - not wokring after moving from rpi3 to rpi4

I just changed by RPI from RPI3 to RPI4. I did a clean install and restored backup from my existing installation (Full backup).
I have a Raspbee 2 that I moved to the RP4, I changed the config.txt to enable uart.

Now I get this error message saying:
Logger: zigpy_deconz.uart
Kilde: /usr/local/lib/python3.12/site-packages/zigpy_deconz/uart.py:32
Førs oppstått: 09:55:26 (2 hendelser)
Sist logget: 09:55:45

Lost connection: SerialException(‘device reports readiness to read but returned no data (device disconnected or multiple access on port?)’)
Traceback (most recent call last):
File “/usr/local/lib/python3.12/site-packages/serial_asyncio_fast/init.py”, line 141, in _read_ready
data = self._serial.read(self._max_read_size)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “/usr/local/lib/python3.12/site-packages/serial/serialposix.py”, line 595, in read
raise SerialException(
serial.serialutil.SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)

Any tip on what to verify/change? Do I have to redo this complete install?
https://phoscon.de/en/raspbee2/install

-B

Additional info. I moved the RaspBee card back to the old RPI3, and everything works smooth. So the RaspBee device should be good.